yaml文件中的初始键是任意的，如何在Go中读取它们？

import (
    "fmt"
    "io/ioutil"
    "log"

    "gopkg.in/yaml.v2"
)

func readYAMLFile(filename string) ([]byte, error) {
    data, err := ioutil.ReadFile(filename)
    if err != nil {
        return nil, err
    }
    return data, nil
}

type Config struct {
    Key1 string `yaml:"key1"`
    Key2 int    `yaml:"key2"`
    Key3 bool   `yaml:"key3"`
}

func parseYAML(data []byte) (*Config, error) {
    config := &Config{}
    err := yaml.Unmarshal(data, config)
    if err != nil {
        return nil, err
    }
    return config, nil
}

package main

import (
    "fmt"
    "io/ioutil"
    "log"

    "gopkg.in/yaml.v2"
)

type Config struct {
    Key1 string `yaml:"key1"`
    Key2 int    `yaml:"key2"`
    Key3 bool   `yaml:"key3"`
}

func readYAMLFile(filename string) ([]byte, error) {
    data, err := ioutil.ReadFile(filename)
    if err != nil {
        return nil, err
    }
    return data, nil
}

func parseYAML(data []byte) (*Config, error) {
    config := &Config{}
    err := yaml.Unmarshal(data, config)
    if err != nil {
        return nil, err
    }
    return config, nil
}

func main() {
    // 读取yaml文件
    data, err := readYAMLFile("config.yaml")
    if err != nil {
        log.Fatal(err)
    }

    // 解析yaml数据
    config, err := parseYAML(data)
    if err != nil {
        log.Fatal(err)
    }

    // 打印解析结果
    fmt.Println("Key1:", config.Key1)
    fmt.Println("Key2:", config.Key2)
    fmt.Println("Key3:", config.Key3)
}